ANALYSIS OF NARROW MULTI-BEAM SURVEY DATA AROUND SUBMARINE CANYONS OFFSHORE OF SEISHO COAST
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- FUJII Masato
- 国土交通省関東地方整備局京浜河川事務所
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- ITO Hitomi
- 国土交通省関東地方整備局京浜河川事務所
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- SUZUKI Kenya
- 国土交通省関東地方整備局京浜河川事務所海岸課
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- UDA Takaaki
- 一般財団法人土木研究センターなぎさ総合研究室 兼日本大学理工学部海洋建築工学科
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- IGARASHI Tatsuyuki
- 一般財団法人土木研究センター河川・海岸研究部
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- GOMI Hisahide
- 三洋テクノマリン（株）沿岸域マネジメント部
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- TATEISHI Kengo
- 三洋テクノマリン（株）沿岸域マネジメント部
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- SHIGEHARA Toshihiro
- 三洋テクノマリン（株）技術第1部
Bibliographic Information
- Other Title
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- 西湘海岸沖海底谷周辺でのNMB観測データの解析
- セイショウ カイガンオキ カイテイダニ シュウヘン デ ノ NMB カンソク データ ノ カイセキ
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Abstract
A narrow multi-beam suruvey was carried out offshore of the Seisho coast in Kanagawa Prefecture to investigate the offshore seabed topography. Three extremely steep seabed slopes were discovered in the submarine canyon offshore of the Morito River mouth with a slope angle ranging between 66° and 77°, which has a high possibility of the slope failure during an earthquake. Moreover, a streak pattern was found on the steep slope at the east end of the submarine canyon. This was assumed to be formed by the discharge of sand supplied by the eastward longshore sand transport. Similarly, another streak pattern was found at the west end of the submarine canyon which was assumed to be formed by the discharge of sand supplied by westward longshore sand transport.
Journal
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- Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)
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Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 72 (2), I_793-I_798, 2016
Japan Society of Civil Engineers